Fixes: 864/clusterfuzz-testcase-4774385942528000 See: [FFmpeg-devel] [PATCH 1/2] avcodec/h264_direct: Fix runtime error: signed integer overflow: 2147483647 - -14133 cannot be represented in type 'int'
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc> --- libavcodec/h264_direct.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/libavcodec/h264_direct.c b/libavcodec/h264_direct.c index 66e54479d1..dac9f9d1a8 100644 --- a/libavcodec/h264_direct.c +++ b/libavcodec/h264_direct.c @@ -48,8 +48,13 @@ static int get_scale_factor(H264SliceContext *sl, if (td == 0 || sl->ref_list[0][i].parent->long_ref) { return 256; } else { - int tb = av_clip_int8(poc - poc0); + int64_t pocdiff0 = poc - (int64_t)poc0; + int tb = av_clip_int8(pocdiff0); int tx = (16384 + (FFABS(td) >> 1)) / td; + + if (pocdiff0 != (int)pocdiff0) + avpriv_request_sample(sl->h264->avctx, "pocdiff0 overflow\n"); + return av_clip_intp2((tb * tx + 32) >> 6, 10); } } -- 2.11.0 _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
